Mix first 6 ingredients and bake in a 9x13-inch pan for 40 mins at 350*. When you take cake out of the oven,punch holes over top of cake all the way to pan. Use a fork to pierce every inch or so. Cover with a mixture of powder sugar and frozen lemonade. Pour on cake slowly until all is absorbed. Cut and top each piece with whipped topping. Serves: 10-12